Improved drill-stock



@eine tetes' stent @fitta MARTIAL HAINQUII, C'IsAN FRANCISCO, CALIFORNIA, ASSIGNCR To HIM- SIILFAND .ICRN LCWTH, CF SAMEl PLACE.

Latem Patent No. 79,115, ma Jim@ 2e, 186e.

' IMPRCVRD DRILL-STOCK.

TO ALL WHOM IT MAY CON CERN Be it known that I,.MAIITIAL HAINQUE, of the 4city and county of -San Francisco, and State of California,

have invented a new andimproved Implement or Tool for Drilling Metals by Hand; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which-q Figure lis a vertical section,

Figure 2 is a sectional plan,

Figure 3 an elevation, and

Figures 4, 5, 6, 7, and 8, detached'dctails of the parts.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation, as follows: p i

I make of suitable material my drill-stock A, figs. 1, 2, and 3, having at bottom the usual socket fr drill, andimmediately above, a shoulder, a, upon which .the sleeve-piece B rests; thence upwards from this shoulder, for a distance corresponding with the width of the sleeve B, it is turned, and finished to iit this sleeve; thence above, terminating in the usual feed-screw.

The sleeve-piece B may be made of cast malleable iron or other suitable material, and is formed to tit and revolve around the drill-stock A, having projecting lugs, b, to form a fulcrum for the handle or lever, and through which thefulerum-pin passes.v rlhis sleeve is slotted betweenwthe lugs, to admit the introductionof the gib C, and may be made with activity for an additional back gib, C', fig. 8, or plain, as shown in iig. 4, accordingly asin practice it may be found better.' The gibs C C are made of hardened steel, and are formed to titareund the drill-stock, and make an easy tit in the sleeve-piece B. u v

The handle or lever D may be made of cast malleable iron or other suitable material, and has its fulcrumend formed eccentrically or cain-shaped, and bears directly against. the gib C. Upon the side of this handle is attached a stout spring, d, which, bearing against the sleeve-piece B, tends to set back' the lever or handle, and keeps the cam-bearing against the gib, thus avoiding back-lash or looseness. This handle is connected with the sleeve-piece B by the fulcrum-pin, as shown in tig. 1.

Immediately above the sleeve B, and to keep the same in place, is provided a check-ni1t,'E, which screws down to a shoulder on the feed-screw. This may also be made of cast malleable iron.

The compensating-sleeve Fis similar to those ordinarily used for like purposes, and needs no description here.

I may here remark that the gib-pieces C C may be either made plain, as shown in fig. 6, or with corrugatedor V-shaped grooves, as shown in Iig.'7, the drill-stock against which they press being at that peint provided with corresponding rings, which shall fit in these grooves, to'increase the frietional surface.

The operation and principle of the tool is as i'ollows: Y

|The handle or lever D, having an eccentrically or cam-shaped end, being directly in contactwith the gib C,-will, when never. so slightly moved in an inward direction nponits fulernm, bind this gib against the drillstock A, when, by reason of the createdrfriction, it will cease to revolve around the drill-stock,` but will, if the lever be continued in its revolution about the axis of thc drill, carry the drill-stock with it, and thus perform the drilling until the stroke is finished, when, by a slight movement' of `the handle in an opposite direction, the pressure against the gib is released, and the friction ceasing, the handle, sleeve, and gib are easily setback, swinging loosely around the drill-stoel as inr as is convenient te obtain another purchase, when the operation is repeated. A

It will easily be perceived that the principle here involved is also applicable to other machines, for instance,-

` the anchorwinch of a ship, or any other machine where the ordinary pawl and ratchet finds use, the which my said parts being constructed and' arranged substantially as described.

machine is intended to replaee.`

What I claim as my invention, and desire to secure by Letters Patent, is The combination of the drill-stock A with the lever D, the plain or corrugated gib C, and the sleeve B, the

MARTIAL IIAINQUR.

Witnesses:

GEORGE PARDY, C. H. Evans. 

